Thunder storms SCV

Sprinklers irrigate the grass behind Fernando Mendez as he loosens soil along a path at Pacific Crest Park in Saugus on Friday.

Thunder rattled windows in Canyon Country and startled some Saugus residents awake early Friday as a moist monsoonal air mass moved through the Santa Clarita Valley.

Temperatures during the day remained mild for the season under cloudy skies, but the moist air kept things sticky Friday while refusing to yield measurable rainfall, according to the National Weather Service.

Highs reached 88 in the Newhall Pass on Friday, 93 in Saugus and 93 in Acton.

An upper-level low to the west of Southern California will move into the area during the weekend, deepening the marine layer, which could extend into the Santa Clarita Valley tonight, National Weather Service forecasters said.

Highs are expected to reach 93 today but they will dip into the 80s on Sunday and continue in the 80s during the early part of next week.